Annular floating toothed gearing



F 1949' B. G. w. BARTLETT 2,462,455 Q ANNULAR FLOATING TOOTHED GEARING 7Filed Aug. 9, 1945 2 Sheets-Sheet 1 Feb. 22, 1949. B. G. w. BARTLETT2,462,455

ANNULAR FLOATING TOOTHED GEARING Filed Aug. 9, 1945 2 Sheets-Sheet 2Fig. 4; Ig y/Z M ./4

Patented Feb. 22, 1949 UNITED STATES PATENT OFFICE ANNULAR FLOATINGTOOTHED GEARING land Application August 9, 1945, Serial No. 609,757 InGreat Britain August 12, 1943 Section 1, Public Law 690, August 8, 1946Patent expires August 12, 1963 7 Claims.

This invention relates to floating annular toothed gearing of the typewherein a toothed gear is disposed on the inner surface of an annularfloating ring and is adapted to engage an externally toothed pinion, andwherein an external annular portion of said floating ring, which may beof the character of a gear comprising spur sprocket teeth or a pulleysurface, is adapted to be engaged by a drive transmission member, as,for example, a toothed gear wheel, a belt or a chain for the purpose oftransmitting a drive to or from the said inner toothed pinion. Theobject of the invention is to provide improvements in annular gearing ofthe type described.

Floating annular gearing of the type described, according to thisinvention, is characterised in that the diameter of the pulley surfaceor the pitch diameter of the external gear on the annular ring is equalto the pitch diameter of the internal gear thereon.

Referring to the accompanying drawings:

Fig. 1 is an elevation of one form of annular gearing according to theinvention, and

Fig. 2 is a corresponding transverse sectional elevation on line II-IIof Fig. 1.

Fig. 3 is a fragmentary elevation of a modifled form; and

Fig. 4 is a corresponding transverse sectional elevation.

In Figs. 1 and 2 an annular floating ring H is provided with an externalannular portion, as, for example, a sprocket gear I2 adapted to beengaged by a drive transmission member, as, for example, a chain [3whereby a drive may be transmitted from a driving member not shown.

The ring ll-.is also provided with an internal toothed gear .14 adaptedto engage the teeth of a toothed pinion l5 mounted on a shaft Hi towhich the said drive is to be transmitted. The

sprocket tooth gear [2 is formed on a ring I! 2 comprises two toothedrings 2|, 21, disposed one on each side of and secured to a disc 22, theperimeter of said disc forming shrouds 23 to the teeth on the rings 2|at the pitch circles thereof. The rings l8 also provide shrouds 24 forthe internal teeth on the rings 2fl at the pitch circles thereof, andthe shrouds 23 are adapted to roll on the shrouds 24 when the gear I5engages the gear [4.

A roller 25, which acts as a safetykeep formed of two discs 26, 26mounted on a spring loaded spindle 21, is also adapted to roll on theshrouds 24, or some other flange of the floating ring. The said spindle21 is mounted in a fork 28 on a plate 29. Another plate 30 is rigidly orpivotally mounted on a spindle 3i projecting from a plate 32 and theplate 29 is resiliently supported by the plate 30 by means of pins 33and springs 34. The relative positions of the shrouded annular ring II,the pinion l5 and the roller 25 are such that the axes thereof are inalignment, the axis of roller 25 being diametrically opposite the axisof pinion I5 relative to the axis of ring II, when the runs of the chainor belt I3 are adjusted and more or less taut, and a line through theaxis of pinion I6 and the point of contact 35 between the interal gearl4 and the pinion 15 makes an angle of approximately degrees with a linethrough the axes of the pinion I 5 and the driving member (not shown).The springs 34 press the roller 25 on to the shrouds 24 of the annularring I I, and the roller 25 which functions under spring tensionfacilitates the adjustment of the chain or belt and acts as a safetydevice to retain the ring II in position in the event of chain or beltbreakages.

In the modified form of; device shown in Figs. 3 and 4 the drive istransmitted from the driving member (not shown) by means of a drivetransmission member in the form of a belt 36, the an: nular shroudedring ll being provided externally with a co-acting pulley surface 31 ona ring l1; the pulley surface 31 is transversely aligned with the pitchcircles of the toothed rings 20 of the internal gear M. The remainingfeatures of the annular gear are similar to those in the form shown inFigs. 1 and 2.

By using an improved floating annular gear according to this inventionwhen gearing up within limits and transmitting a high velocity missionmember, and a floating ring for trans mitting driving movement betweensaid pinion and member, the said floating ring having an internaltoothed gear in driving-coacting relation ship with said pinion and'anexternal-annular portion in driving-coacting-reI-ationship withsaiddrive-transmission member, and the -pitch diameter of said internaltoothed gear being substantially equal to the diameter'iof saiiiexternal annular portion at which the driving relationship is effectivebetween the latter'and said drivetransmission member.

2. Gearing according to claim 1, further characterized in that the saidinternal toothed gear and said external annular portion of the floating1 "ringiare inYaXiaI alignment.

- 3. G.earin'g accordingtorclaim 1, further characterized in'thatithesaid external annular portion of the floating ring is-a'toothed gear andsaid fdrive-transm-iss'ion :member has portions which, in toperation,mesh-with said latter toothed 1 Gearing according toiclaim 1, furthercharacterized in that the said external annularportiton=tofzthef'fioatingaring'is asprocketgear and'saidfdrive-transmission "member .is a chain drivxingly ccoactingWithisai'd sprocket gear.

5. Gearing =a'ccording toclaim 1, 'further charaeterizethinfthat thesaidzexternal annular portionooftthelfloating'ring 'is a pulleytsurfaceand said drive-transmission member is a belt drivingly coacting withsaid pulley surface.

6. Gearing according to claim 1, further characterized in that the saidfloating ring has substantially similar opposite annular side portionsand an external circumferential recess intermediate said side portions,the said internal toothed gear being in-"two similar portions disposedupon the inner peripherieso'f said side portions, the said externalannular portion being located in said circumferential recess, and thepinion having its teeth in two similar annular parts in meshingrelationship with the two mentioned similar portions of the internaltoothed gear.

7. Gearing according to claim 6, further characterized in that the saidpinion comprises spaced outwardly extending radial flanges on which thesaid two parts 'ofthe pinion teeth are disposed andsaid-floating ringhas a radial flange extendin'g inwardly between and in guiding relation-.ship with respect to said flanges of the pinion to maintain the latterand said ring in intimate axial operating association.

-BENSON GEORGE WILLIS BARTLETT.

REFERENCES CITED "Tillie following references are of record in the fileof this patent:

UNITED STATES PATENTS Number 7 Name Date 426,370 Evans Apr. 22, 1890451,987 Underwood May-12, 1891 453,630 Evans -June 9, I891 FOREIGNPATENTS Ziumber "Country Date "415,085 -Great Britain Aug. 17, 1934457,016 France -July 2, 1913

